Privacy / Android
CallShield
A privacy-first call blocker for GrapheneOS.
CallShield is a lightweight Android call blocker built for GrapheneOS, designed to respect privacy: it screens incoming calls without becoming your default dialer and without reading your call log. Blocklist, allowlist, and spam screening all run on-device, offline-first.
Features
Blocklist + allowlist
Per-number labels and a blocked-call log, with allowlist rules that always ring through.
On-device spam screening
Neighbor-spoof and withheld-number heuristics plus opt-in community lists — all without leaving the phone.
Quiet hours + private stats
Scheduling, a blocked-call stats dashboard, and encrypted export/import. Offline-first by design.
Who this is for
- GrapheneOS users who want spam blocked without surrendering their data
- Privacy-focused people who refuse to grant a blocker their call log
- Anyone tired of neighbor-spoof and spam calls
Built with
AndroidKotlinOn-deviceGrapheneOS
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